-Pool has been very clear for the last month since I been keeping the pool covered with a solar blanket, using liquid chlorine and keeping CL at about 9.0 ppm.
-Since Sunday pool has a green tint. So I shock to 25 ppm and turn pump to full speed 24 hrs. Pool holds chlorine over night and only drops a few ppm during the day with the solar cover on but pool not clearing up.
-I have also noticed steps getting more rusty appearance and more stains on bottom (vinyl) that wouldn't scrub out.
-New pump this year.
-Pool heater is 10 yrs old (LAARS).
-I only added water (well) one time this year a few weeks back.
Am I fighting algae or something else?
FC 12.5, CC 0.5, PH 7.5, ALK 120, CYA 50. Only use liquid chlorine.